WOODWARD 9907-149工控調速器
系統按照相應的測試流程和選定測試參數進(jìn)行溫度控制和測試工作，如圖3所示。系統最大可以提供-45℃～200℃的溫度環(huán)境，全溫度范圍升溫時(shí)間小于23分鐘，降溫時(shí)間小于25分鐘。系統測試過(guò)程提供三種模式：指定溫度范圍內階梯式升\降溫連續測量；多個(gè)指定溫度點(diǎn)定時(shí)保溫循環(huán)測量；在升\降溫過(guò)程的指定溫度點(diǎn)的恒溫老化、室溫測量。環(huán)境控制精度可以達到±0.1℃。系統通過(guò)巡檢方式對各個(gè)老化板上對應元器件進(jìn)行性能測試。
WOODWARD 9907-149工控調速器可以測試元器件的電阻（阻值）、電容（電容、耐壓值或漏電流），電感（感抗），三端穩壓器（輸入輸出電壓、紋波抑制比）、二極管（正向壓降、向擊穿電壓）、高頻變壓器（線(xiàn)圈電感、轉換比、空載特性、掃頻特性），網(wǎng)絡(luò )變壓器（線(xiàn)圈電感、轉換比、空載特性、高頻特性），功率變壓器（線(xiàn)圈電感、轉換比、空載特性、負載特性）等。
3軟件實(shí)現 測試系統軟件基于Lab VIEW進(jìn)行設計開(kāi)發(fā)，主要采用狀態(tài)機并行處理結構，將事件響應與數據流執行方式有機結合，使整個(gè)系統具有較高的穩定性、實(shí)時(shí)性和可靠性。 軟件在功能實(shí)現上采用模塊化的方式，特定的模塊實(shí)現特定的功能，主要組成模塊有測量驅動(dòng)模塊，控制模塊，外部操作驅動(dòng)模塊，硬件維護模塊，系統安全保護模塊，用戶(hù)登錄與權限管理模塊，參數配置模塊，數據分析與顯示模塊，數據存儲與輸出模塊等測量驅動(dòng)模塊主要控制儀器實(shí)現測量功能；溫度控制模塊采用閉環(huán)控制算法實(shí)現對溫控箱的溫度控制；外部操作驅動(dòng)模塊通過(guò)對數字 I/O 端口的監控，完成各種動(dòng)作狀態(tài)的監視，并通過(guò)報警驅動(dòng)功能，用報警燈對測試進(jìn)程及測試結果進(jìn)行直觀(guān)的指示；為了生產(chǎn)安全和質(zhì)量保障的需要，在軟件中設計了專(zhuān)門(mén)的用戶(hù)登錄與權限管理模塊，可以分配管理員與一般操作者兩種權限，一般操作者只具有操作權限；軟件通過(guò)參數配置模塊實(shí)現傳感器檢測參數的設定、存儲、加載和保存等功能；檢測過(guò)程中，數據分析與顯示模塊會(huì )對檢測參數、測試過(guò)程、測量數據與波形、最終結果等進(jìn)行動(dòng)態(tài)、直觀(guān)的顯示，同時(shí)利用數據存儲與輸出模塊將測試結果實(shí)時(shí)存儲在Excel文件中，并可通過(guò)數據回放功能對數據進(jìn)行查看；
The use and configuration of DTU is troublesome. Generally, it only supports 485 communication. The protocols are basically modbus, and do not support the proprietary protocols of PLC of various brands. In addition, DTU basically belongs to transparent transmission. The upper computer system protocol is used to analyze the received data. There is no handshake protocol when sending data in the process of network transmission, and it is easy to lose data due to network interference. DTU generally needs to do the upper software personnel also need to understand the Modbus protocol, and the bottom hardware personnel also need to convert the PLC protocol into Modbus protocol. In the early DTU, network nodes need to be configured, and the use of DTU requires high requirements for technicians. There is also the transparent transmission protocol, which adopts the polling communication mode, so the transmission data cannot be too much, and the delay is relatively large. Generally, the transmission cycle needs about 10s.
The majority of DTU is GPRS communication. With the large-scale commercial use of 4g\5g, GPRS network has the risk of network withdrawal. However, DTU is cheap and can be used in environments that do not require high data real-time and stability. The protocol gateway is a hardware module with built-in PLC protocols of various brands. Like the touch screen, through the upper software configuration, select the communication
